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tcg: Use umax in ussub if available

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Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson committed 2026-10-24 17:14:50 +02:00
1 parent c86fbb6b2a
commit 76499fb445
1 file changed
+12 -3
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tcg/tcg-op.c
+12 -3
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@@ -1086,9 +1086,18 @@ void tcg_gen_ussub(TCGType type, TCGTemp *dst, TCGTemp *src1, TCGTemp *src2)
{
g_autoptr(TCGTemp) tmp = tcg_temp_new_ebb(type);
tcg_gen_sub(type, tmp, src1, src2);
tcg_gen_movcond(type, TCG_COND_LTU, dst, src1, src2,
tcg_constant_internal(type, 0), tmp);
if (tcg_op_supported(INDEX_op_umax, type, 0)) {
tcg_gen_umax(type, tmp, src1, src2);
tcg_gen_sub(type, dst, tmp, src2);
} else {
/*
* While umax can be expanded with movcond, some hosts can
* perform movcond with a zero source in fewer insns.
*/
tcg_gen_sub(type, tmp, src1, src2);
tcg_gen_movcond(type, TCG_COND_LTU, dst, src1, src2,
tcg_constant_internal(type, 0), tmp);
}
}
void tcg_gen_xor(TCGType type, TCGTemp *dst, TCGTemp *src1, TCGTemp *src2)